:::RHMT::: Real Home Made Turbo

General Category => General Discussion => Topic started by: carkrazed on September 23, 2010, 10:16:29 PM

Title: Anyone good at Integrals?
Post by: carkrazed on September 23, 2010, 10:16:29 PM

Integrate this MF'er

sin^3(3x) Cos^4(3x)

here's what I got

-1/6 (1/5(cos^5(3x)-1/7(cos^7(3x)) + c                                       

Title: Re: Anyone good at Integrals?
Post by: LS1pwNzJ00 on September 23, 2010, 10:17:28 PM

cheezeburger.

Title: Re: Anyone good at Integrals?
Post by: 92CXyD on September 23, 2010, 10:18:25 PM

Quote from: carkrazed on September 23, 2010, 10:16:29 PM

Integrate this MF'er

here's what I got

-1/6 (1/5(cos^5(3x)-1/7(cos^7(3x)) + c                                       

So want this expression make it into an integral right?

Title: Re: Anyone good at Integrals?
Post by: DasPoop on September 23, 2010, 10:26:38 PM

Ti-89 never don me no bad yup yup

Title: Re: Anyone good at Integrals?
Post by: Teg2boo on September 23, 2010, 10:31:34 PM

You all sucks at interweb

http://www.wolframalpha.com/input/?i=-1/6+(1/5(cos (http://www.wolframalpha.com/input/?i=-1/6+(1/5(cos)^5(3x)-1/7(cos^7(3x))+%2B+c+

copy paste, linky no worky

Title: Re: Anyone good at Integrals?
Post by: 92CXyD on September 23, 2010, 10:48:03 PM

using the supplied link you a totally different answer.

Title: Re: Anyone good at Integrals?
Post by: shadow on September 23, 2010, 10:54:09 PM

i used to know how to do this, wtf. now im just lost lol

Title: Re: Anyone good at Integrals?
Post by: 92CXyD on September 23, 2010, 11:04:37 PM

Well your answer is not right.

I tried doing it by hand I'm a little rusty. Looking at my tables of Integrals you will me using u substitution and a reduction formula. ;D

I have a degree in mathematics but I just usually use my trusty HP50g or Maple 11 program.

But that math link comes in handy.  ;D

Title: Re: Anyone good at Integrals?
Post by: snm95ls on September 23, 2010, 11:21:50 PM

I hate integrating trig functions.

I could do it, but I would probably have to double check a reference of some sort.

Title: Re: Anyone good at Integrals?
Post by: turbohf on September 23, 2010, 11:38:41 PM

i lost you after integra :?:

Title: Re: Anyone good at Integrals?
Post by: 92CXyD on September 23, 2010, 11:45:10 PM

Let u=3x and du=3 dx

http://www.wolframalpha.com/input/?i=sin%5E3%283x%29+Cos%5E4%283x%29 (http://www.wolframalpha.com/input/?i=sin%5E3%283x%29+Cos%5E4%283x%29)

makes sense the only problem I have is if your professor only wants you to use the integral table in your book.

In my old Calculus and Analytic Geometry 7th ed. it is #68 or #69.

I usually use Maple 11 for this so I can get the rest of my work done.  ;D

 

Title: Re: Anyone good at Integrals?
Post by: Jorsher on September 24, 2010, 01:02:29 AM

Haven't touched that shit since high school.

Wouldn't know where to start ???

Title: Re: Anyone good at Integrals?
Post by: 97Econobox on September 24, 2010, 10:58:47 AM

Quote from: LS1pwNzJ00 on September 23, 2010, 10:17:28 PM

cheezeburger.

Dont you know asians are better at math than you.  The answer is clearly cheeseburgers